A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies

Cengiz Camci, K. Kim, S. A. Hippensteele

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

This study focuses on a new image processing based color capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. The present method is highly applicable to the surfaces exposed to convective heating in gas turbine engines. This study shows that, in single-crystal mode, many of the colors appearing on the heat transfer surface correlate strongly with the local temperature. A very accurate quantitative approach using an experimentally determined linear hue versus temperature relation is possible. The new hue-capturing process is discussed in detail, in terms of the strength of the light source illuminating the heat transfer surface, effect of the orientation of the illuminating source with respect to the surface, crystal layer uniformity, and the repeatability of the process. The method uses a 24-bit color image processing system operating in hue-saturation-intensity domain, which is an alternative to conventional systems using red-green-blue color definition. The present method is more advantageous than the multiple filter method because of its ability to generate many isotherms simultaneously from a single crystal image at a high resolution, in a very time- efficient manner. The current approach is valuable in terms of its direct application to both steady-state and transient heat transfer techniques currently used for the hot section heat transfer research in air-breathing propulsion systems. (A)

Original languageEnglish (US)
Pages (from-to)765-775
Number of pages11
JournalTRANS. ASME-J. TURBOMACHINERY
Volume114
Issue number4
DOIs
StatePublished - Jan 1 1992

Fingerprint

Liquid crystals
Heat transfer
Color
Color image processing
Single crystals
Propulsion
Gas turbines
Isotherms
Light sources
Image processing
Turbines
Heating
Temperature
Crystals
Air

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

@article{a1759e82ba454993a87afdf7f06a6ece,
title = "A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies",
abstract = "This study focuses on a new image processing based color capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. The present method is highly applicable to the surfaces exposed to convective heating in gas turbine engines. This study shows that, in single-crystal mode, many of the colors appearing on the heat transfer surface correlate strongly with the local temperature. A very accurate quantitative approach using an experimentally determined linear hue versus temperature relation is possible. The new hue-capturing process is discussed in detail, in terms of the strength of the light source illuminating the heat transfer surface, effect of the orientation of the illuminating source with respect to the surface, crystal layer uniformity, and the repeatability of the process. The method uses a 24-bit color image processing system operating in hue-saturation-intensity domain, which is an alternative to conventional systems using red-green-blue color definition. The present method is more advantageous than the multiple filter method because of its ability to generate many isotherms simultaneously from a single crystal image at a high resolution, in a very time- efficient manner. The current approach is valuable in terms of its direct application to both steady-state and transient heat transfer techniques currently used for the hot section heat transfer research in air-breathing propulsion systems. (A)",
author = "Cengiz Camci and K. Kim and Hippensteele, {S. A.}",
year = "1992",
month = "1",
day = "1",
doi = "10.1115/1.2928030",
language = "English (US)",
volume = "114",
pages = "765--775",
journal = "Journal of Turbomachinery",
issn = "0889-504X",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "4",

}

A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. / Camci, Cengiz; Kim, K.; Hippensteele, S. A.

In: TRANS. ASME-J. TURBOMACHINERY, Vol. 114, No. 4, 01.01.1992, p. 765-775.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A new hue capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies

AU - Camci, Cengiz

AU - Kim, K.

AU - Hippensteele, S. A.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - This study focuses on a new image processing based color capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. The present method is highly applicable to the surfaces exposed to convective heating in gas turbine engines. This study shows that, in single-crystal mode, many of the colors appearing on the heat transfer surface correlate strongly with the local temperature. A very accurate quantitative approach using an experimentally determined linear hue versus temperature relation is possible. The new hue-capturing process is discussed in detail, in terms of the strength of the light source illuminating the heat transfer surface, effect of the orientation of the illuminating source with respect to the surface, crystal layer uniformity, and the repeatability of the process. The method uses a 24-bit color image processing system operating in hue-saturation-intensity domain, which is an alternative to conventional systems using red-green-blue color definition. The present method is more advantageous than the multiple filter method because of its ability to generate many isotherms simultaneously from a single crystal image at a high resolution, in a very time- efficient manner. The current approach is valuable in terms of its direct application to both steady-state and transient heat transfer techniques currently used for the hot section heat transfer research in air-breathing propulsion systems. (A)

AB - This study focuses on a new image processing based color capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies. The present method is highly applicable to the surfaces exposed to convective heating in gas turbine engines. This study shows that, in single-crystal mode, many of the colors appearing on the heat transfer surface correlate strongly with the local temperature. A very accurate quantitative approach using an experimentally determined linear hue versus temperature relation is possible. The new hue-capturing process is discussed in detail, in terms of the strength of the light source illuminating the heat transfer surface, effect of the orientation of the illuminating source with respect to the surface, crystal layer uniformity, and the repeatability of the process. The method uses a 24-bit color image processing system operating in hue-saturation-intensity domain, which is an alternative to conventional systems using red-green-blue color definition. The present method is more advantageous than the multiple filter method because of its ability to generate many isotherms simultaneously from a single crystal image at a high resolution, in a very time- efficient manner. The current approach is valuable in terms of its direct application to both steady-state and transient heat transfer techniques currently used for the hot section heat transfer research in air-breathing propulsion systems. (A)

UR - http://www.scopus.com/inward/record.url?scp=0026803502&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026803502&partnerID=8YFLogxK

U2 - 10.1115/1.2928030

DO - 10.1115/1.2928030

M3 - Article

VL - 114

SP - 765

EP - 775

JO - Journal of Turbomachinery

JF - Journal of Turbomachinery

SN - 0889-504X

IS - 4

ER -